Abrading element



March 12, 1957 A. N. EMMONS ABRADING ELEMENT Filed June 29, 1953 INVENTOR. ,ARTI'HUR N. [HMO/v S.

ATTORNEY.

United States Pat ABRADING ELEMENT Arthur N. Emmons, Nedrow, N. Y., assignor to The Porter-Cable Machine Company, Syracuse, N. Y., a corporation of New York Application June 29, 1953, Serial No. 364,605

1 Claim. (Cl. 29-431) This invention relates in general to abrading elements, and more particularly to an abrading element having a multiplicity of circular cutters arranged in an annular series of stack formations forming a cylindrical cluster of cutters.

Abrading elements of this type are used on power operated tools employed extensively for removing rust and scale from metal plates, or other objects.

The invention has as an object an abrading element of the type referred to embodying the structural arrangement which is particularly economical to manufacture and which may be quickly and conveniently disassembled, or partially disassembled, for the removal of damaged cutters and in the insertion of new cutters.

The invention consists in the novel features and in the combinations and constructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanying drawings in which like characters designate corresponding parts in all the views.

In the drawings- Figure 1 is an end view of an abrading element embodying my invention. 1

Figure 2 is a sectional view taken on line 2--2, Figure 1.

Figure 3 is a view taken on line 3-3, Figure 2.

The abrading element consists of a spool-like structure formed by a pair of disks 1d mounted on the ends of a tubular member ll. Preferably, the tubular member is non-circular in cross section, or formed with a non-circular bore to effect a driving connection with the machine on which the abrading element is mounted. A machine of this type is described in Patent No. 1,874,220, issued August 30, 1932, to F. E. Aurand.

The disks it) are formed with an annular series of apertures, those in one direction being alined with those in the other direction. An annular series of pins 12 is positioned in these apertures, the pins extending parallel to the tubular member ll. and the ends of the pins extending outwardly through the disks 10. The outwardly extending end portions of the pins are formed with circumfereutial grooves 13 and the pins are detachably mounted in the disks by snap rings 14 of the radially expansive type, these rings being positioned on the outer surfaces of the disks 1t) and engaging the grooves 13, whereby the pins 12 are held against axial movement.

On each of the pins 12 there is mounted a plurality of cutters 15. These cutters are of circular form and have teeth 16 at their peripheries. The cutters are formed with bores 17 of a diameter substantially greater than the diameter of the pins 12, whereby the cutters are loosely mounted on the pins for radial movement toward and from the axis of the tubular member. The cutters 15 are maintained in spaced relation by spacing collars 18 mounted on the pins and interposed between the cutters.

The arrangement is such that the cutters mounted on one pin are positioned axially of the pins in registration with the collars on the next adjacent pin, whereby the toothed portion of the cutters on one pin are free to move between the toothed portion of the cutters on the next adjacent pin.

The abrading element is mounted upon the spindle of the power operated tool and is rotated as a whole about the axis of the spindle. During this rotation, centrifugal force moves the cutters l5 outwardly, as indicated by the bottom cutter in Figure 1. As the cutters engage the material being worked upon, they are free to move on the pins inwardly toward the axis of the tubular member or spindle, and as the stacks of cutters on the pins successively engage the material, there is a yielding impact effected by the stacks of cutters which is effective in the removal of rust or scale from the work being cleaned. During this engagement, some rotation is imparted to the individual cutters and due to the staggered mounting of the cutters on the pins, the rotation of one stack of cutters is more or less frictionally imparted to the cutters on adjacent pins, whereby the teeth of the cutters wear down uniformly.

Preferably, the end disks 10 are formed with outwardly extending annular flanges 20, these flanges extending outwardly slightly beyond the ends of the pins 12 to minimize the possibility of the ends of the pins striking the work being cleaned, or portions thereof extending perpendicular to the surface being acted on by the cutters. This prevents the ends of the pins from becoming burred, or otherwise damaged.

To replace the cutters, or any portion of them, it is only necessary to contract the snap ring 14 for its removal from the grooves 13, whereby the pins can be removed axially from the disks for the insertion of new cutters.

What I claim is:

An abrading element comprising a tubular member non-circular in cross section and having a disk mounted on each end thereof and fixed against rotation relative thereto, said disks being formed adjacent their peripheries with alined apertures, an annular series of pins positioned in said apertures with the ends of the pins extending beyond the outer surfaces of the disks, the extending end portions of the pins being formed with circumferential grooves, a plurality of cutters loosely mounted in side by side relation on each pin between said disks, and a radially expansive snap ring positioned on the outer surface of each disk within the annular series of pins and engaging the grooves formed in the end portions thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,397,227 Minor Nov. 15, 1921 2,150,806 McDermet et al Mar. 14, 1939 2,199,383 Aurand May 7, 1940 2,382,947 Brozek Aug. 14, 1945 OTHER REFERENCES Truarc Publication (page 2). 

